You don't solve nazi ideology with reasoned debate. You don't solve it with deplatforming either but I doubt facebook is going to start throwing bricks so I'll take it.
Better not let him iterate the overreach in the first place.
And of all the ways FB is making the world worse, "letting Nazis have a soapbox" is least of their problems.
How did you reach that conclusion?
History repeats itself and people on the left want to pretend you solve this problem with the debate club.
People respond with their best arguments when they are confronted with bad ideas.
People respond with censorship attempts and violence when they are scared that their own positions are weak.